I seriously can't comprehend how pinheads DON'T have a tumbler.
I'm thinking of a SECOND one !
I've spent YEARS without one, but now that I have some more resto's to do, I can't see how I would do them without it.
I'll give you a tip. Use this stuff ;
http://www.marcospecialties.com/itemdesc.asp?ic=FTMA34Mark usually gets it in for me.
What usually takes 12 - 24 hours to polish will take 4 hours with Flitz.